Preheat the grill to medium-high heat.
In a mixing bowl, combine BBQ sauce, honey, olive oil, garlic powder, onion powder, salt, and pepper. Mix well to create the marinade.
Add the chicken breasts to the marinade, ensuring they are completely coated. Let them marinate for at least 10 minutes.
Meanwhile, prepare the vegetables. In another bowl, toss the zucchini, bell peppers, and onion with olive oil, salt, pepper, and dried herbs if using.
Place the marinated chicken on the preheated grill. Grill for about 6-7 minutes per side, or until the chicken reaches an internal temperature of 165°F (75°C).
While the chicken is grilling, place the vegetables on the grill. Cook for about 8-10 minutes, turning occasionally, until they are tender and slightly charred.
Once cooked, remove the chicken and vegetables from the grill.
Allow the chicken to rest for a few minutes before slicing. Serve the chicken alongside the grilled veggie medley.